Apr 2, 2015. The Software Update service included with Oerver lets you host Apple. OS. X can use the same URL to connect to your server to download updates. If you are not authenticated, click the lock and enter the name and. Unable to download Apple SUS catalog, Antony A, 8:52 PM. Warning: Could not download Apple SUS catalog. Finishing. Getting info on currently. 29. Okt. 2013. Checking Apple Software Update catalog. Caching. URL returned error: 404. Not Found warning: Could not download Apple SUS catalog.